| 赵伟霞,张振华,蔡焕杰,单志杰.间接地下滴灌导水装置规格参数模型[J].水利学报,2009,40(3): |
| 间接地下滴灌导水装置规格参数模型 |
| Parameter model of water conducting device specification for indirect subsurface drip irrigation |
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| DOI： |
| 中文关键词: 间接地下滴灌 导水装置规格 积水入渗 参数模型 Philip模型 水量平衡原理 |
| 英文关键词: indirect subsurface drip irrigation water conducting device specification parameter model Philip model principle of water balance |
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| 摘要点击次数: 3532 |
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| 中文摘要: |
| 本文根据灌水过程中水量平衡原理为间接地下滴灌建立了导水装置规格(直径，高度)参数模型，该模型中综合考虑了滴头流量、灌水定额、土壤水力特性等参数对导水装置规格的影响。通过室内恒定水头钻孔积水入渗试验与Philip模型的应用，研究了不同导水装置规格类型对三维土壤渗吸率S和土壤入渗率A的影响。基于三维土壤入渗率A等于稳定入渗量QS的假定，定量化了导水装置规格模型中的土壤水力特性参数。通过大田间接地下滴灌试验，验证了模型的可行性。结果表明，Philip模型可用于描述三维恒定水头钻孔积水入渗过程，但在土壤类型一定时，三维入渗中的土壤渗吸率S和土壤入渗率A还与导水装置总的透水面积有关。该模型设计的导水装置规格能满足间接地下滴灌灌水过程中水分不外溢的要求。间接地下滴灌灌水过程中变化的渗透面积和恒定水头钻孔积水入渗过程中恒定的渗透面积之间差异的存在，是模型误差产生的主要来源。 |
| 英文摘要: |
| According to the principle of water balance in the process of indirect surface drip irrigation the parameter model of water conducting device specification was established. The influence of different factors, including the emitter discharge rate, irrigation application mode and hydraulic properties of soil, were considered. The soil water sorptivity S and soil water transmissivity A in 3-D infiltration were studied under the condition of different water conducting device specification through the experiment with constant head infiltration in laboratory and through the application of Philip model. Based on the hypothesis that A was equal to the amount of steady infiltration, the parameter of soil hydraulic properties can be quantified. The validity of the parameter model was verified by the indirect subsurface drip irrigation experiment in field.The results indicate that the Philip model can be used to describe the three dimensional infiltration process in drilling holes under constant water head. The S and A for one kind of soil are related to the total infiltration area of the water conducting device. The devices designed according to the principle of water balance and Philip model can satisfy the requirement of without occurrence of overflow in the irrigation process. |
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